The Difficulty of Knowing

"My words are very easily known, and very easily practised. (Yet) none in the world can know them, or can practise them. The words have an ancestry, and the things have a Head. But because these are not understood, therefore I am not known. Few are they who know me. Worthy are they who copy me. For the sage wears a coarse garment, and hides his jewel in his bosom."